Extensively refitted in 2015, National Geographic Sea Bird is a small, no-frills charmer of a ship that carries 62 guests in low-key comfort to off-the-beaten-track ports in Alaska, the Sea of Cortez, and along the Columbia and Snake rivers. The Lindblad Expeditions ship, along with her twin, National Geographic Sea Lion, is for true explorers looking to delve deeply into ports, with a top-notch expedition team and trekking and kayaking galore.